Harrow.



PATENTED JAN. 23, 1906.

A. C. PALMER.

HARROW.

APPLICATION FILED APR.27,1905.

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HARROW.

Specification of Letters Patent.

Patented Jan. 23, 1906.

Application filed April 27, 1905. Serial No. 257,701.

To all whom t may concern.-

Be it known that I, ANDREW C. PALMER, a citizen of the United States,residing at Washington, in the county of Daviess and State of Indiana,have invented new and useful Improvernents in Harrows, of which thefollowing is a specification.

This invention relates to harrows of the rotary type, and has for itsobjects to produce a comparatively simple inexpensive device of thischaracter by which the breaking and harrowing of the ground will berapidly and efficiently performed, one wherein the harrowing teeth orblades may be readily removed from or replaced upon the cylinder whencircumstances require, and one wherein the teeth will be maintained infirm secure position upon the cylinder or drum.

Vith these and other objects in view the invention comprises the novelfeatures of construction and combination of parts more fully hereinafterdescribed.

In the accompanying drawings, Figure 1 is a top plan View of a harrowembodying the invention. Fig. 2 is a detail end view, partly in section,of the tooth or blade carrying drum. Fig. 3 is a perspective view of oneof the blades.

Referring to the drawings, 1 designates a frame composed of angle-ironor other suitable material and comprising side bars 2 and front and endbars 3, there being bolted within the frame at suitably-spaced intervalsand at intermediate points transverse braces 4, while bolted to the sidebars 2 are bearings 5, adapted to receive for rotation adrive-shaft 6,which extends transversely of the frame 1 at a point centrally betweenthe braces 4 and is equipped with ground-wheels 7. Fixed on the outerends of the shaft 6 are sprocketwheels 8, connected by chains 9 withsprocketpinions 10, in turn fixed upon the shaft 11 of a drum 12, whichlatter comprises in its organization a pair of annular heads 13, fixedin any appropriate manner upon the shaft 11, and a plurality of,preferably four, bars or webs 14, composed of angle-iron and havingtheir ends bolted or otherwise secured to the heads 13, the bars beingarranged at diametrically-opposed points relative to the heads and thecentral shaft 11 being journaled for rotation in suitable bearings 15 onthe side bars 2. Carried by the drum 12 is a series of teeth or blades16, each formed from a single piece of metal, as shown in Fig. 4, andhaving at its normally inner end a spring-engaging portion or hook 17and at its outer end an active or cutting portion 18, disposed ina planeat right angles tothe plane of the body of the tooth 16, which latterfor this purpose is during its formation given a half-turn at the point19. The teeth are secured upon the drum by engaging the portions orhooks 17 with the central shaft 11 and securing the body of the bladesto the respective webs or angle-bars 14 by means of clip-bolts 20,entered through openings 21, formed in the blades, it being apparentfrom this arrangement that when the blades in practice become worn orotherwise defective they may be readily detached for replacement by newones.

In practice as the machine advances over the ground the drum-shaft 11will be driven from the main shaft 12 through the medium of thechain-and-sprocket gearing', it being obvious that owing to the relativesizes of the wheels 8 and pinions 10 the drum will rotate at acomparatively high rate of speed relative to the shaft 6, thus to effecta thorough and rapid breaking and harrowing of the ground, and, further,that the speed of the drum may be varied by varying the sizes of thegears and pinions, as will be readily understood. Further, it will beobserved that the teeth 16 will, owing to the improved manner ofattaching them to the drum, be maintained firmly in place and will inpractice, through their hooked portions 17 engaging the shaft 11, assistmaterially in bracing and supporting the drum as a whole upon thelatter.

From the foregoing it is apparent thatI produce a simple inexpensivedevice admirably adapted forthe attainment of the ends in view, it beingunderstood that minor changes in the details herein set forth may beresorted to without departing from the spirit of the invention.

Having thus described my invention, what I claim is- 1. In adevice ofthe class described, a drum comprising a central shaft, end heads fixedthereon and webs attached to the heads, cutting members having portionsfor engagement with the central shaft, and means for attaching thecutting members to the webs.

2. In a device of the class described, a rotary drum comprising acentral shaft, end heads, and a plurality of webs attached to saidheads, blades having spring-engaging portions for engagement with thecentral drum-shaft, and means for attaching the blades to the webs.

3. In a device of the class described, a ro- IOO IIO

tary drum comprising a central shaft, end heads, blades provided -withhooked end por- I0 heads ixed thereon, and a plurality of Webs tionsengaging the shaft, and clip-bolts for atattached to the heads, cuttingmembers havtaching the blades tothe Webs.

ing their inner ends engaged With the central In testimony whereof IafIiX my signature in shaft, and clip-bolts for attaching the memberspresence of two Witnesses.

to the Webs. ANDREW C. PALMER.

4. In a device of the class described, a ro- Witnesses: tary drumcomprising a central shaft, end MILTON S. HAsTINGs,

heads and a plurality of Webs attached to said JosIAH G. ALLEN.

